<template>
 <footer class="footer">
      <span class="todo-count" v-show="leftListLength"><strong>{{leftListLength}}</strong>剩余</span>
      <ul class="filters">
        <li>
          <a :class="{selected:type === 'all'}" 
          href="#/" @click.prevent="changeType('all')">全部</a>
        </li>
        <li>
          <a :class="{selected:type === 'active'}" 
          href="#/active" @click.prevent="changeType('active')">进行中</a>
        </li>
        <li>
          <a :class="{selected:type === 'completed'}" 
          href="#/completed" @click.prevent="changeType('completed')">已完成</a>
        </li>
      </ul>
      <button class="clear-completed" @click="clearDoneList" v-show="isDoneAll">清除已完成</button>
    </footer>
</template>

<script>
 export default {
   name: 'TodoFooter',
   props: {
    leftListLength:{
      type:Number,
      required:true
    },
    isDoneAll:{
      type:Boolean,
      required:true
    },
    type:{
      type:String,
      required:true
    },
   },
   methods:{
    clearDoneList(){
    this.$emit('clearDoneList')
   },
   changeType(type){
    this.$emit('changeType',type)
   }
   }
   
 }
</script>

<style scoped lang='less'>

</style>